Duplex pumping apparatus.



No. 642,446. "Patented Jan. 30, I900. G. B. HIETT.

DUPLEX PUMPING APPARATUS. (Application filed Apr. 2, 1898. Renewed Dec.18, 1899.)

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N0. 642,446 Patented Jan. 30, I900,

- a. B. HIETT.

DUPLEX PUMPING APPARATUS.

(Application filed Apr. 2, 1898. Repewerl Dec. 18, .1899.) (No Model.) 3Sheets-sheaf 2,

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No 642,446. Patented Jan. 30, 1900.

G. B. HIETT.

DUPLEX PUMPING APPARATUS.

(Application filed Apr. 2, 1598. Renewed Dec. 18, 1899. P

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GEORGEB. I'IIETT, OF ATLANTA, GEORGIA, ASSIGNOR OF ONE-HALF TO SAMUELLOUIS BREWER, OF TUSKEGEE, ALABAMA.

DUPLEX PUMPING APPARATUS.

SPECIFICATIONforming part of Letters Patent No. 642,446, dated January30, 1900.

Original application filed June 12, 1897, Serial No. 640,496. Dividedand this application filed April 2, 1898. Renewed December 18,1899.Serial No. 740,826. (No model.)

To all whom it may concern:

Be it known that I, GEORGE E. HIETT, a citizen of the United States,residing at Atlanta, in the county of Fulton and State of Georgia, haveinvented certain new and useful Improvements in Duplex PumpingApparatus; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

This invention relates to improvements in duplex fluid-pressure pumpsfor anhydrousammonia-pumping apparatus, and the present application is adivision of my application for Letters Patent, Serial No. 640,496, filedJune 12, 1897.

The invention has for its object to provide improved mechanism foractuating the ammonia-p11 mps, simple and effective valve-gear for thepumping-engine, and a strong and durable framing for the variousoperative parts of the apparatus.

To these ends the invention consists in the features and in theconstruction, arrangement, and combination of parts hereinafterdescribed, and specifically set forth in the claims following thedescription, reference being had to the accompanying drawings, forming apart of this specification,wherein Figure 1 is a side elevation of aduplex pumping apparatus constructed in accordance with my invention.Fig. 2 is an end elevation thereof. Fig. 3 is a plan view of the same.Fig. 4 is a sectional plan view of the apparatus.

Referring now more particularly to the drawings, wherein likereferencernumerals designate corresponding parts throughout the severalviews, 1 indicates the bed-plate of the apparatus, adapted to besuitably anohored toa foundation of any preferred kind.

.To the opposite ends of the bed-plate are bolted semicylindricalpillars 2, in which are disposed the ammonia-pump cylinders 3. Thepump-cylinders 3 are provided on their sides with flanges 4, which arebolted to the tops of the pillars 2, and from the upper ends of each ofthe pillars project frames, consisting of a partially-circular orsegment-shaped central upright 5 and two outer or side uprights 6. Thesaid frames are securely tied and braced together by four-armed braces7, and at their top are provided with flanges 8, tied together by astay-beam 9, formed of angleplates, as shown.

On the flanges S are supported and bolted vertical steam-power cylinders10, provided with pistons adapted to reciprocate simultaneously inopposite directions, as will more fully hereinafter appear. Thesteam-pistons are provided with depending piston-rods 11, while thepistons in the am monia-pump cylinders 3 are provided withupwardly-projecting piston -rods 12, which are in alinement with thepiston-rods 11. The adjacent ends of the pistonrods 11 and 12 are keyedin cross-heads 13, to the opposite sides of which are attached jaws 14,that engage and travel on cross-head straps 15, rigidly bolted to theuprights 5. The jaws 14 form a movable con nection between thecross-heads and straps and maintain the piston-rods 11 and 12 in perfectalinement and cause the same and the cross-heads to travel in truerectilinear paths. Journaled in bearings in the four armed braces 7 is ashaft 15*, on which is a walkin beam consisting of two parallelcross-beams 16, connected at their opposite ends to the cross-heads 13by links 17. The cross-beams 16 are connected together by a wrist-pin18, which passes through both beams at a suitable point at one side ofthe pivotal center of said beams.

On the wrist-pin 18 is journaled the upper end of a connecting-rod 19,the lower end of which is journaled on a crank-shaft 20, rotating insuitable bearings formed on the bed of the machine. On one of the endsof the shaft 20 is fixedly mounted a fly-Wheel 21, and also fixed onsaid shaft is an eccentric 22. An eccentric-rod 23 is connected at oneend to the eccentric by the usual strap connection, and at its other endis pivotally connected to an oscillating link 24, which in turn ispivotally connected to the four-armed braces 7. To the free end of thelink 24 is pivotally attached one end of a connectingrod 25, the otherend of which is connected by a universal joint 26 to a transverserockshaft 27, journaled in bearings 011 the staybeam To the oppositeends of the rockshaft are fixed crank-arms 28, which project in oppositedirections and which are respectively connected to the valve-stems 29,which actuate the valves of the two steam-cylinders.

Through the medium of the valve-gear just described the pistons of thesteam-cylinders will be caused to reciprocate simultaneously in oppositedirections in a manner that will be obvious, the universal-jointconnection between the connecting-rod and rock-shaft permitting themovements of the connectingrod and rock-shaft arm in the arcs of twodifferent circles or in the arcs of two circles in planes at rightangles with each other. At the same time the pistons 12 of the ammoniapump cylinders 3 will also be caused to reciprocate simultaneouslyin opposite directions in the manner clearly set forth in my formerapplication hereinbefore referred to, to which reference is to be hadfor explanation of the construction and mode of operation of saidcylinders and the piston-heads therein.

It will be understood that changes in the form, proportion, and minordetails of construction may be made within the scope ofthe inventionwithout departing from the spirit or sacrificing any of the advantagesthereof.

Having thus fully described my invention, what I claim as new anduseful, and desire to secure by Letters Patent, is

1. In a duplex pumping apparatus, the combination with a bed-plate and aframe rising therefrom, of two pump-cylinders supported by thebed-plate, two power-cylinders supported by the frame and arrangedvertically above said pump-cylinders, the piston-rods of said pump andpower cylinders being connected at their adjacent ends to cross-heads, awa1king-beam journaled intermediate its ends in said frames, linksconnecting the opposite ends of said walking-beam to the respectivecross-heads, a crank-shaft, a connesting-rod attached to one end of thewalking-beam and to the crank-shaft, a rocking arm actuated from thecrank-shaft and pivoted to the frame, a horizontal rock-shaft arrangedbelow the power-cylinders and carrying two oppositely-extendingcrank-arms attached to the valve-stems thereof, and a connecting-rodattached at one end to the rockshaft by a universal joint and at itsother end directly to said rocking arm, substantially as described.

2. In a duplex pumping apparatus, the combination, with a suitableframe, of two pumpcylinders, two power-cylinders arranged verticallyabove said pump-cylinders, the pistonrods of said pump and powercylinders being respectively connected at their adjacent ends tocross-heads, a walking-beam journaled inend connected by a universaljoint to said rock-shaft, substantially as described.

3. In a duplex pumping apparatus, the combination with a bed-plate, ofsemicircular pillars 2 rising therefrom, pump-cylinders 3 arrangedwithin said pillars and provided with peripheral flanges 4 bolted to thetops thereof, upright frames supported on said pillars and provided attheir up per ends with flanges S, a stay-beam 9 attached to saidflanges, fourarmed braces 7 attached to said upright frames and pillarsrespectively, and powercylinders resting on and secured to the saidflanges, substantially as described.

41. In a duplex pumping apparatus, the combination with a bed-plate, ofsemicircular pillars 2 rising therefrom, upright frames sup ported onsaid pillars and provided at their upper ends with flanges 8, astay-beam 9 attached to said flanges, four-armed braces 7 attached tosaid upright frames and pillars respectively, pump-cylinders arrangedwithin said pillars and secured thereto, power-cylinders supported onsaid flanges, the pistonrods of said power and pump cylinders beingrespectively connected at their adjacent ends to cross-heads traversingguides on said upright frames, a walking-beam mounted on a shaft havingbearing in the fourarmed braces, and links connecting the ends of thewalking-beam to the respective cross-heads, substantially as described.

5. In a duplex pumping apparatus, the combination of a frame, a pair ofpump-cylinders, one arranged at each end of the frame, a pair ofpower-cylinders, one arranged vertically above each pump-cylinder, thepiston-rods of said pump and power cylinders being respectivelyconnected at their adjacent ends to cross-heads, a walking-beamjournaled in the frame and having its opposite ends connected to saidcross-heads to operate the piston-rods of the pump and power cylindersat one end of the frame in unison and the respective pairs of cylindersat opposite ends thereof alternately, a crankshaft, a connecting-rodattached to one end of the walking-beam and to the crank-shaft, aneccentric arranged on the crank-shaft, an eccentric-rod actuated therebyand connected to an oscillating arm, In testimony whereof I aflix mysignature a rock-shaft connected to the valve-stems of in presence oftwo witnesses.

the power-cylinders to operate the same simultaneously in reversedirections, and a con- GEORGE HIEDT necting-rod attached at one end tosaid oscil- I Witnesses:

lating arm and at its other end to said rock- GLADYS L. THOMPSON,

shaft, substantially as described. GENEVIEVE MATTHEWS.

